Abdominal wall fat index, estimated by ultrasonography, for assessment of the ratio of visceral fat to subcutaneous fat in the abdomen. - Suzuki,R.; Watanabe,S.; Hirai,Y.; Akiyama,K.; Nishide,T.; Matsushima,Y.; Murayama,H.; Ohshima,H.; Shinomiya,M.; Shirai,K.; Saito,Y.; Yoshida,S.; et al. (Am J Med, 1993)